force int type on order in fourier function
force int type on order in fourier function

necessary for range(order) call in L102.
(This is a change required by python3, in which say 16/2=8.0, not 8).

Former-commit-id: 37eeae2864f296c74ff05561d61749d0975ea889
lgbouma/astrobase,lgbouma/astrobase,lgbouma/astrobase,waqasbhatti/astrobase,waqasbhatti/astrobase,waqasbhatti/astrobase